Present perfect or past simple?

[email protected] в категроии Английский язык, вопрос открыт 13.06.2018 в 21:32

-What are you doing this weekend?
-I dont know. I/not/decide/yet.

-I cant find my adressbook. Have you seen it?
-it/on the table/last night.

-Are you hungry?
-I/just/eat.

-Paula and Sue are here?
-Are they? what time/they/arrive?